In the mid-credits scene, Buddy and Mel attend what they think is a costume party at Leonard's house. Buddy dresses up as a Barbaloot from Dr. Seuss' The Lorax and Mel is dressed up as a Minion. The party is interrupted when the owner returns.
In the Illumination Entertainment logo, Bob the Minion is happily walking while humming a tune, until the 'MIN' and 'ION' parts of the logo light up. When the entire logo lights up, Bob happily says its name and squeals with joy.